Oceanbox Designs™ Refractometer for Saltwater Reef Tank Salinity Level

A refractometer is an essential tool to a successful reef aquarium to pinpoint the accuracy of the salinity (saltwater) level. In a reef tank, the required salinity is 1.025-1.026sg.


  • Used to measure the salinity and specific gravity of saltwater.
  • Sturdy and light weighted aluminium body.
  • Superior quality rubber grip.
  • High quality and accurate testing result.
  • Can be easily calibrated with a mini-screw driver.
  • Automatic temperature compensation (ATC).
  • Easy to use, included convenient carrying case.


  • Size(approx): 195 x 40mm
  • Measure Range: 0-100%(0-10%)
  • Accuracy: 0.001sg(1%)
  • Salinity Proportion: 1.000-1.070sg